GENTECH archive


Fw: Reply to KRRS & Monsanto, archives 448, 461, 462

Yes, but you don't answer the essence of my question. These plants are genetically engineered with a toxin that is supposed to kill bollworms when they start to eat the cotton. So why aren't some of the bollworms killed?
-----Original Message-----
From: Rick Roush <>
To: Clive Elwell <>
Cc: <>
Date: Friday, 4 December 1998 16:49
Subject: Re: Reply to KRRS & Monsanto, archives 448, 461, 462

Dear Clive:

In my personal experience and from the data of many others, for the species of bollworms that is a problem in India, the Bt cotton plants don't kill all of the bollworms that feed on the cotton plant. In that sense, the Bt cotton plants are only partially effective. However, even without killing all of the bollworm larvae, the plants can yield well and greatly reduce insecticide needs.

For some other species of bollworms (as in the US and Mexico), the Bt cotton is very effective.


Dear Rick
why, in your opinion, is GE Bt "only partially effective"?
Clive Elwell

-----Original Message-----
Rick Roush <<>>
To: <<>>
Date: Thursday, 3 December 1998 16:09
Subject: Reply to KRRS & Monsanto, archives 448, 461, 462

With the publication of
Field trials of cotton varieties not `terminator' related
archive 462, if not on 25 Nov (see below), Prof M D Nanjundaswamy surely knows that Bt cotton is not terminator related.

Also, it should not be expected that the Bt cotton will kill ALL bollworms, Like many environmentally friendly approaches, it is only partially effective.

Richard T. Roush
Associate Professor and Director Phone +61 8 8303-6591
Centre for Weed Management Systems FAX +61 8 8303-7125
Waite Institute ;-_|\
University of Adelaide / \
Glen Osmond 5064 ( )
South Australia \_;-*_/
South Australia

Cooperative Research Centre for Weed Management Systems:

"Weeds - Australia's most underestimated environmental threat"